The Spinner dolphin is the most acrobatic and abundant of all cetaceans in Sri Lankan waters. They are small, slender dolphins with a long, slim beak. The head is very slim at the apex of the melon. The surface pattern is a three-tone arrangement: dark grey, creamy white or pink on the belly. Some may have a dark lateral stripe between the medium-grey flanks and belly. A dark stripe extends from the eye to the flipper. The tip of the beak and the lips are black. They diet on epipelagic and mesopelagic fish, shrimp and squid.